Reactor Operator Practice Exam

Dose equivalence accounts for how biologically harmful different types of radiation are by weighting the energy deposited in tissue with a quality factor. The absorbed dose measures energy per unit mass, but radiations differ in their biological impact, so you multiply that dose by a radiation quality factor to get the dose equivalent. In traditional units, the absorbed dose is in rads, and multiplying by the quality factor gives the dose equivalent in rem. In SI units you’d use grays times the radiation weighting factor to get sieverts. The idea throughout is the same: dose equivalence = absorbed dose × quality factor. The other options don’t reflect this adjustment for radiation type. Energy deposited per unit mass is the absorbed dose itself, not the adjusted dose for biological effect. Dose rate times exposure time yields a total dose but not the biologically weighted dose.